:root{--bg:#efede8;--menu:#f7f5f1;--card:#fff;--line:#d8d3ca;--text:#222;--accent:#8f2d24}
*{box-sizing:border-box} html,body{margin:0;height:100%;font-family:Arial,Helvetica,sans-serif;color:var(--text);background:var(--bg)}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline}
.layout{display:grid;grid-template-columns:260px 1fr;min-height:100vh}
.sidebar{background:var(--menu);border-right:1px solid var(--line);padding:24px 18px;position:sticky;top:0;height:100vh;overflow:auto}
.brand{font-size:20px;font-weight:700;margin:0 0 20px}
.menu-title{font-size:12px;letter-spacing:.08em;color:#666;text-transform:uppercase;margin:0 0 12px}
.menu{list-style:none;padding:0;margin:0} .menu li{margin:0 0 8px}
.menu a{display:block;padding:10px 12px;border-radius:8px;background:#fff;border:1px solid var(--line)}
.content{padding:0} iframe{name:content;width:100%;height:100vh;border:0;background:#fff}
.wrap{max-width:920px;margin:0 auto;padding:28px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px;box-shadow:0 1px 2px rgba(0,0,0,.04)}
h1{font-size:42px;line-height:1.1;margin:0 0 18px} h2{font-size:26px;margin:0 0 14px}
.meta{color:#666;margin-bottom:18px}.linklist{list-style:none;padding:0;margin:0}.linklist li{padding:8px 0;border-bottom:1px solid #eee}.linklist li:last-child{border-bottom:0}
article{font-size:18px;line-height:1.6}.article-nav,.topnav,footer{display:none !important}
img{max-width:100%;height:auto}
.homebox{max-width:720px;margin:48px auto;padding:32px;background:#fff;border:1px solid var(--line);border-radius:14px}
.homebox h1{font-size:34px;margin-bottom:10px}.homebox p{color:#555}
@media (max-width:900px){.layout{grid-template-columns:1fr}.sidebar{position:relative;height:auto}.content iframe{height:75vh}}

.context{color:#666;font-size:.92em;font-weight:normal;}